Decla is a turnkey online platform that lets fiduciary and accounting firms in the canton of Vaud, Switzerland, digitize their clients' tax returns. Clients fill in an automated, guided questionnaire, upload their documents securely and pay online via Stripe, with automatic invoicing. Each firm gets its own branded page on a dedicated subdomain (yourfirm.decla.ch) and tracks every client in one place, instead of emails, paper and reminders. Built for fiduciary firms, not for taxpayers directly.